This is running on Fredrik's stock app with Red Bear BLE Nano II:
Shtok prefers the HM13 due to its smaller size, but the Red Bear Nano II is pretty small as well. I fit it into the Imperial Knight chassis, which is 1" OD. Along with TeensySaberV3 and OLED monitor. Blue Tooth control is a lot of fun!
PS: I had to wire this one off the Teensy 3.2 back pads, and that required a bit of extra programming that Fredrik helped me out with.